Alert archive / South Dakota / Tornado Warnings in 2017

Tornado Warning 27, NWS Sioux Falls, SD

August 13, 2017Bon Homme County, Charles Mix County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Aug 13, 2017, 4:39 PM CDT for Bon Homme County, Charles Mix County, South Dakota. It was in force for 36 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 13, 2017, 4:39 PM CDT (21:39 UTC)
Expired: Aug 13, 2017, 5:15 PM CDT
In force: 36 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

Counties Bon Homme County, SD, Charles Mix County, SD

The radar

The Sioux Falls radar (KFSD), 128 km from the middle of the area, began a volume at 21:39 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Aug 13, 5:24 PM CDT	HAIL 1.25	3 N Dante, SD

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 13, 4:00 PM CDT	Severe Thunderstorm Watch	SPC	11 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 9.7 hours before the alert went out and 202 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 308 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 693 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 178 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

996 
WFUS53 KFSD 132139
TORFSD
SDC009-023-132215-
/O.NEW.KFSD.TO.W.0027.170813T2139Z-170813T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Sioux Falls SD
439 PM CDT SUN AUG 13 2017

The National Weather Service in Sioux Falls has issued a

* Tornado Warning for...
  East central Charles Mix County in south central South Dakota...
  Northwestern Bon Homme County in southeastern South Dakota...

* Until 515 PM CDT
    
* At 439 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Wagner, or 12 miles east of Lake Andes, moving
  east at 40 mph.

  HAZARD...Tornado and half dollar size hail. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* This dangerous storm will be near...
  Dante around 450 PM CDT. 
  Avon around 500 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Sioux Falls.

&&

LAT...LON 4309 9835 4319 9831 4313 9785 4295 9794
TIME...MOT...LOC 2139Z 287DEG 34KT 4312 9829 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

Ferguson

2 follow-up statements

434 
WWUS53 KFSD 132154
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
454 PM CDT SUN AUG 13 2017

SDC009-023-132215-
/O.CON.KFSD.TO.W.0027.000000T0000Z-170813T2215Z/
Charles Mix SD-Bon Homme SD-
454 PM CDT SUN AUG 13 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 515 PM CDT FOR
SOUTHEASTERN CHARLES MIX AND NORTHWESTERN BON HOMME COUNTIES...
    
At 454 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Wagner, or 14 miles east of Pickstown, moving east
at 25 mph.

HAZARD...Tornado and ping pong ball size hail. 

SOURCE...Radar indicated rotation. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely. 

This dangerous storm will be near...
  Dante around 505 PM CDT. 
  Avon around 515 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

If a tornado or other severe weather is spotted, report it to the
National Weather Service or your local nearest law enforcement agency
who will send your report. This act may save lives of others in the
path of dangerous weather.

&&

LAT...LON 4308 9833 4318 9826 4313 9785 4295 9794
TIME...MOT...LOC 2154Z 288DEG 21KT 4309 9824 

TORNADO...RADAR INDICATED
HAIL...1.50IN

$$

Ferguson

794 
WWUS53 KFSD 132216
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
516 PM CDT SUN AUG 13 2017

SDC009-023-132226-
/O.EXP.KFSD.TO.W.0027.000000T0000Z-170813T2215Z/
Charles Mix SD-Bon Homme SD-
516 PM CDT SUN AUG 13 2017

...THE TORNADO WARNING FOR SOUTHEASTERN CHARLES MIX AND NORTHWESTERN
BON HOMME COUNTIES HAS EXPIRED...
    
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and a
Severe Thunderstorm Warning remains in effect for the area.

A severe thunderstorm watch remains in effect until midnight CDT for
south central and southeastern South Dakota.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Sioux Falls.

LAT...LON 4308 9833 4318 9826 4313 9785 4295 9794
TIME...MOT...LOC 2216Z 287DEG 34KT 4303 9799 

$$

Ferguson

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 13, 3:16 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Douglas	44 min
Aug 13, 3:54 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Douglas, Hutchinson	51 min
Aug 13, 4:20 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix, Douglas, Hutchinson	25 min
Aug 13, 4:24 PM CDT	Severe Thunderstorm Warning	FSD	Hanson, Hutchinson, McCook, Turner	36 min
Aug 13, 5:15 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix	30 min
Aug 13, 5:40 PM CDT	Tornado Warning	FSD	Bon Homme, Charles Mix	35 min
Aug 13, 5:42 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha	33 min
Aug 13, 5:52 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha, Moody	23 min
Aug 13, 6:39 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme	21 min
Aug 13, 6:44 PM CDT	Severe Thunderstorm Warning	FSD	McCook, Minnehaha	31 min
Aug 13, 6:58 PM CDT	Tornado Warning	FSD	McCook	17 min

Nearby

Tornado Warnings in South Dakota, 2017 Every tornado warning in 2017 Tornadoes in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.